Ændringer i tilstande: dampe. Hollandske Heike Kammerling Ones (1853-1926), fra Leiden, formåede at gøre helium flydende i 1908. Anonym illustration fra 1925. Privat samling.(Changes in states: vapours. Dutch Heike Kammerling Ones (1853-1926), from Leiden, managed to liquefy helium in 1908. Anonymous illustration from 1925. Private collection.)Anonymous Anonymous |
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